United Kingdom, Sept. 30 -- Keith Urban's friends were not surprised by his split from Nicole Kidman.

The 57-year-old country singer is reported to have separated from the Babygirl actress after 19 years of marriage, and while fans around the world were stunned by the news, those closest to the Let It Roll hitmaker felt it was only a matter of time.

A source told People magazine it "really hasn't been a secret" that Nicole, 58, and Keith have "been living separately for a while now."

The insider added: "People close to Keith felt like the split was kind of inevitable."

Meanwhile, Nicole - who has daughters Sunday, 17, and Faith, 14, with Keith, and Bella, 32, and 30-year-old Conor from her marriage to Tom Cruise - is said to be leanin...